Pressure-controlled switch



May s, 1928. 1,669,202

M. LASSEN PRESSURE CONTROLLED SWITCH Filed 001;. 1?, 1924 l3 A Z i I: 5;, if

I I? I 3 44 A mm wk 7 1 1 6 E I FH I 45 IN VEN TOR.

ATTORNEY.

Patented May 8, 192 8.

reeazcz hi it MANUEL LASSEN, F DETROIT, MIOHEGAN.

BRESSURE-CONTROLLED SYVITCH.

Application filed October 17, 1924. Serial No. 244,285.

This invention relates to means for opening and closing electric circuits as the pres sure or liuid increase. abovcor decreases below predetermined points, and its object is to provide a device of this character which can be adjusted as to pressure, which shall not readily get out of order, and which can be produced at relatively low cost.

This invention comprises a fluid-pressure operated diaphragm and a lever actuated thereby in one direction and resilient means to move the lever in the opposite direction, a pivoted closed tube into which two contacts extend and in which a globule of mercury is adapted to flow into one end to close the circuit between such contacts when the tube is tilted into one position and is adapted to How into the other end to break the circuit between said contacts when the tube is tilted into its other position, and a deferred-movement connection between said lever and said tube.

It further consists in means for varying the tension of the resilient means so as to predeterniine the pressure of the fluid at which the electric circuit between said coutacts shall be opened.

It also consists in the details of construction illustrated in the accompanying drawing and particularly pointed out in the claims.

In the drawing, Fig. l is an el vation of my improved switch with the end of the cover broken away. Figs. 2 and 3 are sections on the lines 2-2 and 3-8 of Fig. 1, respectively. Fig. 4 is a view similar to Fig. 1 with the switch tube removed. Fig. is an elevation of the multiplying lever.

Similar reference characters refer to like parts throughout the several views.

he base 1 is preferably circular and has a hub 2 to receive the pipe 3 and a hole 4 leading to the space adjacent the diaphragm 5 which is of anvdesirable metal, depending upon the character of the fluid under pressure which is to control the switch. A packing ring 6 of fabric or composition prevents leakage bet-ween the diaphragm and the base and the diaphragm is held in position by the metallic washer 7. by the disk 8 and by the screws 9. The disk 8 has a central aperture 10 through which the button 12 extends, this button preferably having a circular toot 13 contacting with the diaphragm and attached thereto if desired.

A small bracket 14 is attached to the disk 8 and supports the pivot pin .15 on which the main operating lever 16 is mounted. This lever carries an adjustable screw 17 which contacts with the button 12 and a second screw 18 which contacts with the disk 8. Two threaded posts 19 extend from the disk 8 through the cross bar 20 which presses the main lever 16 toward the disk 8, through the springs 22 which engage this cross bar and the nuts 23, and through holes in the cap 2:; which is held in place by the nuts The nuts 23 and springs 22 determine the pressure of the fluid below the diaphragm which is able to swing the main lever 16 against the tension of these springs. Yashors 26 may be employed if. desired.

A si'nall bracket 27 secured to the disk 8 carries a pin 28 on which the multiplying lever 29 is mounted. this lever having a. notch to receive the pin 30 extending laterally from the main lever 16. A link hooks into the outer end of the multiplying lever and extends to the switch. but its connection therewith will be explained later on.

The cap 24 has two notches to receive the sle ves 33 which support the conductors 34 and 35 and the flexible wires 36 and 37 con nect-ing to these conductors. The wires 36 and 3? connect into the well known switch tube 88 to the bars 39 and 40 which terminate in the contacts 41 and i2. Within the tube is a globule 43 of mercury which is adapted to close the circuit between the contacts ll and 42.

Two posts ist erztend from the disk 8 and carry the short plates 45, which, in turn, support the pivot pins 46. A small yoke 4-7 is mounted to hang on these pins and a resilient plate attached to the bottom of this yoke has a curved arm 49 which fits around the tube 38 and supports it. The tube therefore tilts on the axis of the pins 46 and this axis is preferably about the middle point of the tube.

Ii l ounted on these pins is having sides 50 and a top 51. Attached to the lower end of the front side of this yoke is a short arm (Fig. 4:) to which the link connects. This large yoke will therefore swing to the right l and i) a larger who when the springs 22 overcome the pressure of the fluid on the diaphragm 5 and to the left when the pressure of the fluid on the diaphragm overcomes the springs. A tension spring 53 connects the middle point of the top 51 of the large yoke with the center of the middle portion of the yoke 47.

When the pressure of the fluid back of the diaphragm is below the predetermined point. the parts are in the positions shown in the drawing. As this pressure increases sufiiciently, the operating lever 16 swings away from the disk 8 and the multiplying lever 29 swings down (in Figs. 1 and 4) causing the arm 52 (Fig. 4) to also swing down. The upper yoke 5l now swings toward the left, but the lower yoke 47 remains in the position shown until the central line of the spring 53 passes to the left of the axis of the pivot pins 46, at which time the spring 53 suddenly swings the lower yoke clockwise, or to the left in Figs. 1 and 4, swinging the tube 38 to such an extent as to cause the globule 43 to run to theright end thereof and bridge the contacts 41 and This delayed-action, quick-operating device reduces arcing at the contacts 41 and 42.

It is evident that this tube might be reversed and the circuit between the contacts broken by increasing pressure of the controlling fiuid and made with decreasing pressure. However, the yoke 50--51 will swing to the right or clockwise with decreasing pressure. The yoke 5051 may swing considerable distances either way without affecting the yoke 7 and the switch tube andthe electric circuit will not be affected by small variations of pressure. I prefer to attach a stop'plate with arms 61 to the cross bar 20'to limit the movements of the upper yoke and to attach a stop plate 62 with arms 63- to the posts 44 to limit the move ments of the lower yoke and switch tube.

The details of construction andtheproportions of the parts may all be, changed by those skilled in the arts without departing from the spirit of my invention as set forth in the following claims. 7

I claim v 1. In a pressure controlled electric switch, the combination of a base and a pressure controlled. diaphragm mounted thereon, a main lever moved in one'direction by the diaphragm, resilient means to move the lever in the opposite direction, a multiplying lever, a pivoted switch tube and contacts and a globule of mercury therein, and resilient connections between the multiplying lever and said tube to swing the same on its pivot as the pressure'on the diaphragm increases and decreases.

2. In a pressure controlled electric switch the combination of a base and a pressure controlled diaphragm mounted thereon, a main lever moved in one direction by the diaphragm, resilient means to move thelever in the opposite direction, a multiplying lever, a pivoted switch tube and contacts and a globule of mercury therein, and connections between the multiplying lever and said tube to swing the same on its pivot as the pressure on the diaphragm increases and decreases comprising a pair of yokes, one connected to the multiplying lever and the other to the switch tube, and a spring connecting said yokes.

3. In a pressure controll d electric switch, the combination of a base and a pressure controlled diaphragm mounted thereon, a main lever moved in one direction by 'the diaphragm, resilient means to move the lever in the opposite direction, a multiplying lever, a pivoted switch tube and contacts and a globule of mercury therein, and connections between the multiplying lever and said tube to swing the same on its pivot as the pressure on the diaphragm increases and decreases, said resilient means beingadjustable as to tension so as to predetermiue the pressure on the diaphragm at which the switch tube will be swung.

4. In a pressure controlled the combination of a base, phragm between them, washers spacing the diaphragm from the disk and base, a button on the diaphragm extending through a hole in the disk, a main lever pivoted on the disk and movable in one direction by said diaphragm, springs mounted on the disk to re sist the movement of the lever, a switch tube pivotally mounted on the disk, a movement multiplying device operated by the main lever, and means connecting said multiplying device to said switch tube.

5. In a pressure controlled electric switch, the combination of a base, phragm between them, washers spacing the diaphragm from the on the diaphragm extending through a hole in the disk, a main lever pivoted on the disk and movable in one direct-ionby said diaphragm, springs mounted onthe disk to resist the movement of the lever a switch tube pivotally mounted on the dis amovement multiplying device operated V by the main lever, and means connecting saidniultiplying-device to said switch "tube, comprising a delayed-action quick-operating mechanism to reduce arcing within said switch tube.

electric switch, a disk, a diadisk and base, a button a disk, a dia-- 6. In a pressure controlled electric switch,

the combination of a base, a disk, a diaphragm between them, washers spacing the diaphragm from the disk and base, a button on the diaphragm extending through a hole in the disk, a main lever pivoted on the disk and movable in one direction by said diaphragm, springsmounted on the disk to resist the movement of the lever, a switch tube pivotally mounted on the disk, a movement multiplying device operated by the main lever, means connecting said multiplying device to said switch tube, and means to limit the swinging movements of said switch tube on its pivots.

7. In a pressure controlled electric switch, the combination of a base and a pressure controlled diaphragm mounted thereon, a main lever moved in one direction by the diaphragm, resilient means to move the lever in the opposite direction, a multiplying lever, a pivoted switch tube and contacts and a globule of mercury therein, and connections between the multiplying lever and said tube to swing the same on its pivot as the pressure on the diaphragm increases and decreases comprising a pair of yokes, one connected to th multiplying lever and the other to the switch tube, and a spring connecting said yokes, said yokes being mounted on the same pivots and the switch tube being carried by one of said yokes.

8. In a pressure controlled e ectric switch, the combination of a base and a pressure controlled diaphragm mounted thereon, a main lever moved in one direction by the diaphragm, resilient means to move the lever in the opposite direction, a multiplying lever, a pivoted switch tube and contacts and a globule of mercury therein, eonnec-- ti ons between the multiplying lever and said tube to swing the same on its pivot as the pressureon the diaphragm increases and decreases comprising a pair of yokes pivoted to swing on a common axis, one of said yokes being connected to the multiplying lever and the otherto the switch tube, a spring connecting the free ends of said yokes and adapted to be carried across said axis by the yoke connected to the multiply ing lever, and means to limit the movements of said yokes.

9. In a pressure controlled electric switch, the combination of a base, a disk, a diaphragm between them, washers spacing the diaphragm from the disk and base, a button on the diaphragm extending through a hole in the disk, a main lever pivoted on the disk and movable in one direction by said diaphragm, springs mounted on the disk to resist the movement of the lever, a switch tube pivotally mounted on the disk, a movementmultiplying device operated by the main lever, means connecting said multiplying device to said switch tube, an adjustable screw carried by the main lever and contacting with said button, a second screw carried by the main lever and adapted to contact with the disk to limit the movement of the main lever under the force of said springs, and means to adjust the tension of said springs and thereby predetermine the pressure on the diaphragm at which the switch tube shall be swung 011 its axis.

MANUEL LASSEN. 

